床垫选择，请姐妹给些建议

想在labor day买beauty rest black的床垫，macys Giada extra firm  和 usmatress.com Calista extra firm价格差不多，这两款有什么差别吗？这个价格怎么样？多谢

http://www1.macys.com/shop/product/beautyrest-black-giada-extra-firm-king-tight-top-mattress-set?ID=2678557&CategoryID=30764#fn=MATTRESS_COMFORT%3DExtra%20Firm%26sp%3D1%26spc%3D37%26ruleId%3D88|BS|AS|BA%26slotId%3D7

http://www.us-mattress.com/simmons-beautyrest-black-calista-extra-firm-mattress.html